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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e3b3c75e938a9d237a299f6e8fa150bd55038607d08b410e2f707ad3b1f533' 
  AND token = '4FeNOCCjgTnVWdd80IrvIKjb0L4kCZ8cWtxjBRri0Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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