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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050aec467e0dc214d0ea79871d31445555c1ef43b15742c2fa3e5e95b4f2ac89' 
  AND token = 'eqJ51MFIwlVHnKn9fBqOSHQYj09W1PWYZdf2w30eDwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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