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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e26570fd53d0cb33a15e32c87bcfbde7723524397c9304dc923993be54bce3f' 
  AND token = 'CaDP5SEG7QF5I3aQHq8Iw0mCGr8ZFdx+TpynUsuk65c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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