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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1966dfe1d60d1e74c5819a14ab78cf522790349fbb24298a6162b08cecca88a7' 
  AND token = 'EEq5Wvn9D4zWKR7nnaQOTe7FG98f6+3v6NF9Phf1u+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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