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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62735832ff462d83c7e0c2f1bd2a3ce7a8a89be5417f2976f308e244e2c575cc' 
  AND token = 'Y6kRtb6W7M+U+Jl9Jtk6ZkYEIWMv1j9kpI/buxxCpcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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