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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf76fbdf0fef871e1358a844ab45dc26d465576a46ed82a76b31dbbd73814b20' 
  AND token = 'N3lEBXpAOY77/1xQmCX3Udr5abCacGchWT43M7yB1X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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