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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea4d2b26ab4ea60c79052bd74925e9c4db5400cb82477eed04dd44e271a63c9' 
  AND token = '+WJGeyaH5zkflA48B7aJkYaQsp/KW5gPqrsI//LQkek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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