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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12992b966d449731a6cde60aa0a457177b18f717f33e5194d0d958748b1d3618' 
  AND token = 'Qj0JSjAawCuaFegScmBbL6S7aJUge8Gy3fraGskTjHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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