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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff775cb316a452ff8d6ca45419deb1dfcad53763812dacd01cd588366b084c0' 
  AND token = 'VP4LFRx5YcHwcZ5c8GHQH43Fp66yrFAca0TFg1bGSQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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