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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8209f7bbce44d62965983ad37fc3cad46b0d719d880bb2b8f0c3e91bb5c0188f' 
  AND token = 'C69A7g+A6VQ59sXW/79kE/+5/pC9qI0CUkmJgkCueg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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