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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa99c28d03beb9e32b096d11b1b8eb2db6bb6f86522fc456ae8123413307308c' 
  AND token = 'UVB6GeIRJNjmJHZIYpmDqDho07B3CD0xwkALGejL654=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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