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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7bd034068e8fb0f9fe4826479c0faf62b6a9083a02844b3b88b319e89abc3b' 
  AND token = 'v7qeGvA6hjueHujA+Ii1HKqyp+nruY4Uvo0zr5tASHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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