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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b19bbf3a3bc6ebc9153d595807c7168a6cc9b5968651fadd1aef895e666ed67' 
  AND token = 'Y6aw5Smvh63FkbWLBT0IBnXwTCCEAdah0Otb/TyCwi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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