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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94de12495e6b1a970414cba9b76fad6b2745fde1a29a8ae9ab8c22c08d29ab89' 
  AND token = 'gQ6LC5Lof7D0a91tPAHbIyle6jvYasxzjhguWRhE914=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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