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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72803cea0c6897ce11a26e82416e6c8479a0d60a423ab57f97b57365aaee5a07' 
  AND token = '5G0NFnMb/hl09NqUqHp45uLAIdy0hiXU1kHLRXDAEd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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