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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680946a871cb6523f0b5a091fcc04e2bdb5d773c06b4b5862bdd1fccdf50ab0d' 
  AND token = 'GbsjwSe3qW699Yj1sLS4dEb54FmS6yvtkYR0/2ravYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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