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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380db01b068cec67f271816a1a6c724a05a0c19937bfe3dc9d4cbe9343d345eb' 
  AND token = 'SwGej1FYs4LSdeM0R54WTHZ9iiM36QP+6NKnX4mf/oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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