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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e7eeef938943efe626be37f8b61b686f624b4d5cd09e383966309234f2f633' 
  AND token = 'nKIiWfVKeutDDBV0n0eixnZ1P84Qtl7pi+S5rooVsS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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