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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a7a19a406324f5df39e40542a62f69f2c1ce1d1833f0587cf19e44e054879c' 
  AND token = 'yftEYOMxUF7qUOOFVL1OGP2mrOpYsH2k3l5eYovuH4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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