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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab48ec05e27d339e6f5f767a918987b962fd420fa7953196fe6db5e392b35bc' 
  AND token = 'uysWbSHHkTxy8IdHRaTzy7FVb8I/HNKgJUZC7T/hFi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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