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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852e30c21d4e81c0704a855ef11201e2b38766c8caa500befa8dfde7310718df' 
  AND token = '3GqwdtNcHsZW6aOTY5BVFnz0P7DZtgO87hmf6bElFy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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