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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0893e89f09b9a60af6e22c2af0be49c0b0411b958f8a1c7690eb15638411c157' 
  AND token = 'OFwE3lPWEyJvBMLByecuRao+vgVNzqSTogqQZAoitMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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