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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3509524ba434f588d5a07d2e89edfbea69116198f2586fd8a266044e846227' 
  AND token = 'oj8lcN9WkB52FeeSZt3YoxociMcjThaAFenPWkvJn34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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