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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5ae24e8772d20941b29886f31d1ad43efcb5fec77409c6c47e859403d833bc' 
  AND token = 'P93mZn3VHJh7v2DYpVx2fYEeJ1iTqnH98O+ASMmn27c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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