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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19294fc743700b1627dbf9d3580327da9c45c41f730fcaec32b27c7f3d9961e' 
  AND token = 'n+QmpDl0mRAFPPC+yxT5vkDz9i6HUN6Yn2EYZWopDYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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