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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf72313b8d955dec27dc2e0ab7aea6d6c81a7671984253e9ae0d3d3476a37f3' 
  AND token = 'nOYpj1V015jiwkKO0HVAVtI9TMBQbEy0FyeTUe4JuF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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