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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd565c7c029a6f3d7c4cf569ab280683002e7198096e98bbb3a1c52ce1192827b' 
  AND token = '/hAfH4T4vw6cyaMWaTAXXrmtppSgvYzhRw6xTI1U1Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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