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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724e9b2fdb41f051564738ffded392efc0ef986d0633c607371a01360d6fd3f3' 
  AND token = 'hkwGLnypcl43F3ZX6drslJ7paSOWI2/dAGRWrBOjxtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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