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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5da2e870230a3a2042487adc461c1ba034e1ae9db104c416eff46fedaa51426' 
  AND token = 'tr7xbT/VCg/n4/0AMCYP0KpKdhO1+tu8bnP7dA7hEuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}