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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e010acafa6d58e0f8896519df5cbd5c3e47ab9ca2ec83b52f7e5b6e6d4dec5d1' 
  AND token = 'ImcZERVyu5DEFTc3IBrmM99OQ3rh1wCvPtvk7r70hBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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