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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc371a761847ced66bcaa024bab489ad86917010d00229ca7d9ac7994894a08' 
  AND token = 'AWQM/ozzRayUqUS6rZk9JlI3SuoGsV9q6GH4fBcjJcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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