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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae3a13e1f814c8021b5b925996a917abb858a375bad9ce6cf509328579521fd' 
  AND token = 'QVrQxHz5FbKoz/JXRF/ZArhHwiXpfokfBE5OQVhM8Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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