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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f02775ea1b70112dd141c0d84439c957394def8517be637b8bc2a3cdad9460' 
  AND token = 'qjfOenfE3OP+OruoQOtgl7rUE/+uoZ8ugEk0vYX6uoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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