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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb54a5a4db94907f12679474e6db465ae09f596da15edd3f51cfed22d5fb4f2' 
  AND token = 'bAzKLUIEvchnHPgXMpZ16ObQ/GWr9Bi5CGyec2E5M6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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