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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a970e9e808549f6fe7aca2941ee109e84444894397b74ad82ceb586812cfab' 
  AND token = 'SVQ4rIuex5x7QqlkO4QVGWhQFVV/6isrNojIpOQnKZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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