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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d3a818bd51f1c2c8e7754fe96e07059f5cf24ef6519e01a03d47cf2a196aaf' 
  AND token = '2SBM+iFqqGAc2vsNZ6zrUd0GebWzrr26G0oiHc6/Ij8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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