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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96ab28b03c1caeccf84ab0b67ac414099d1566436c943fc7165703d0f529cd0' 
  AND token = 'sLvoNYzmehhJQLVFuhNxHawfj0wcpRE1G2tOSy6cP7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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