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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e432a2b2ed825dde44aa88f61c26b40808e972d478f08846ff40180144fc0854' 
  AND token = 'dSDNy+AETf16C7fnbX9aHxZ8+9J/dS8GRz7dPCE6T7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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