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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26c6e73d0262207841a3db8ed484d6620b6bdb753e59d2621a1e8e974fcad74' 
  AND token = 'NFgMvnCgag+vY6yMelD0el1/fYDxwQm6qBXlRWv6TSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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