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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a1c5a752e576beb288264e5ac787b732d248f443bca6de38d9479b7af55c2a' 
  AND token = 'O+G4DAfPrmr3bMprXHWpNGYCYOauWknUSy9wZltym48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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