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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df36ef1882856ea564057d138ea62b03e83d7b2099281e9e3d878dcb4e68fe9' 
  AND token = '9PDBbZywSXcBbjsXNANdE78pj0sWmDXXEUn63h07oCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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