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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f013ce2c2d6b1212d9041187a318d2d02f92c865a56418ab924c2be5604c72' 
  AND token = 'QGhmwokGKyATJJN/z5ORE1QY8VsLIxkrCOMEDFJGLs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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