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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27585ce7fa97e4a8b99547f1a349e57e3d52c33c7ee7d03d5e99d0bab32af80c' 
  AND token = 'CkHIRZORmcShImf53cw7JYViOqxL8WCxxuXpB1EOm2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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