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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5baf83f04a2a456166fa0a86ef6171e3820766eca4972fc9ea61215303d824' 
  AND token = 'Suc+JA8qSmDBtvt4FBJcQC/NEvMugbUWZ8hDBiZCdR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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