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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2cf4b0e74e4a361741fe5f69c318fe7a2d9d39889a86ce5101712d3f5e2f8a7' 
  AND token = 'mExXrDCRmLapyqb18tf1/l+Na8TmNpb7HGKKX85oS0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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