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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aeb7c89e8fd02705d21a4eb0e5e41fabc98a2ad5db87d25f6454fe175150553' 
  AND token = 'QD6HNuceIsFp1IueP1wPsziLB13fxHjQG6T8tWMXDqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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