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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c26e03db75871ffdcbb60fd27c870b71b663a93e886e11a2e88259d14e03975' 
  AND token = 'GXaiepO9naVXMyTppA+/rdA6OzJjl3S1UVGls5CuvO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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