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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b0da30bd5c0f9519e2d36c20e27579d05285c0ed7ccedb7709d653b0365f10' 
  AND token = 'uhPueBuHEBCtji/HavOk+x/sRRsBewfx3fyN9nDxF+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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