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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc877fc08a7d5170d33462faec10a5aa7bfcee3ad5dae93fc0e595e85640f65' 
  AND token = 'U8hV6Dt1pj1yyjvUjdaZZ6ZADa5p4/xw7BExSYkjR2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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