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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778eb1e497ac4dff63bf0c94abeeeb366e1e8e2bd47685f2bd1e32c0b904e3a6' 
  AND token = 'T3NPh1dOfc63a2Jcb/s5s2YvEtrInuXq6iXNM3v+wTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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