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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a025aa8786f368a1c9ff9a16789acc5aa6e8953333b1984a3c8daef3654f65' 
  AND token = 'abm2KH1elji/eaLfNcgSt/jCuvMEPNTYpOBNndW3YfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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