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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e384a0abc0344cef7855a2e65c6107047d277b54adeaa2ab1c2aa6bb01cd58' 
  AND token = 'WpU4T1ML26gsOqT3w/X9Frq80A/oOHrNfViH2SRSITs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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